package java201521123069;


import java.util.Scanner;
public class Test3 {

	public static void main(String[] args) {
		
		float num;
		String s,str1;
		int a;
		Scanner in=new Scanner(System.in);
		while(in.hasNextFloat()) 
		{
			int result=0;
			num=in.nextFloat();
			s=Float.toString(num);
			char []Arr=s.toCharArray();
			for(int i=0;i<Arr.length;i++)
			{
				if(Arr[i]!='-'&&Arr[i]!='.')
					 
				{
					result+=Arr[i]-'0';
				}
			}
			
			System.out.println(result);
		}
			

	}

}
